[3.15] Lib-injection max-Python bump in `lib-injection/sources/requirements.csv` (analogue of #12283)

[vlad-scherbich]

note: blocked by #17810

Tracked under parent: #17809

Tier: A
Section: Needs an owner — new work

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Original row from the parent tracker:

• Lib-injection max-Python bump in lib-injection/sources/requirements.csv (analogue of #12283) — @DataDog/apm-core-python

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To close this row, open a PR using the python_315_bump template (added in #17791; open via ?template=python_315_bump.md) and include Closes #<this-issue-number> in the description. That auto-closes this issue on merge, which auto-flips the corresponding checkbox on the parent tracker (#17809).

[vlad-scherbich]

Standalone PR rebased on main: reopening #17977 failed (stale close). New draft PR incoming on vlad/py315-lib-injection-ssi @ 1a37d80429. Does not touch pyproject.toml — SSI-only, same pattern as #15966 for 3.14.

[vlad-scherbich]

Draft PR: #19843 (vlad/py315-lib-injection-ssi @ 1a37d80429, bases on main).